1// -*- C++ -*- 2//===----------------------------------------------------------------------===// 3// 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5// See https://llvm.org/LICENSE.txt for license information. 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef _LIBCPP_NEW 11#define _LIBCPP_NEW 12 13/* 14 new synopsis 15 16namespace std 17{ 18 19class bad_alloc 20 : public exception 21{ 22public: 23 bad_alloc() noexcept; 24 bad_alloc(const bad_alloc&) noexcept; 25 bad_alloc& operator=(const bad_alloc&) noexcept; 26 virtual const char* what() const noexcept; 27}; 28 29class bad_array_new_length : public bad_alloc // C++14 30{ 31public: 32 bad_array_new_length() noexcept; 33}; 34 35enum class align_val_t : size_t {}; // C++17 36 37struct destroying_delete_t { // C++20 38 explicit destroying_delete_t() = default; 39}; 40inline constexpr destroying_delete_t destroying_delete{}; // C++20 41 42struct nothrow_t { explicit nothrow_t() = default; }; 43extern const nothrow_t nothrow; 44typedef void (*new_handler)(); 45new_handler set_new_handler(new_handler new_p) noexcept; 46new_handler get_new_handler() noexcept; 47 48// 21.6.4, pointer optimization barrier 49template <class T> [[nodiscard]] constexpr T* launder(T* p) noexcept; // C++17, nodiscard since C++20 50} // std 51 52void* operator new(std::size_t size); // replaceable, nodiscard in C++20 53void* operator new(std::size_t size, std::align_val_t alignment); // replaceable, C++17, nodiscard in C++20 54void* operator new(std::size_t size, const std::nothrow_t&) noexcept; // replaceable, nodiscard in C++20 55void* operator new(std::size_t size, std::align_val_t alignment, 56 const std::nothrow_t&) noexcept; // replaceable, C++17, nodiscard in C++20 57void operator delete(void* ptr) noexcept; // replaceable 58void operator delete(void* ptr, std::size_t size) noexcept; // replaceable, C++14 59void operator delete(void* ptr, std::align_val_t alignment) noexcept; // replaceable, C++17 60void operator delete(void* ptr, std::size_t size, 61 std::align_val_t alignment) noexcept; // replaceable, C++17 62void operator delete(void* ptr, const std::nothrow_t&) noexcept; // replaceable 63void operator delete(void* ptr, std:align_val_t alignment, 64 const std::nothrow_t&) noexcept; // replaceable, C++17 65 66void* operator new[](std::size_t size); // replaceable, nodiscard in C++20 67void* operator new[](std::size_t size, 68 std::align_val_t alignment) noexcept; // replaceable, C++17, nodiscard in C++20 69void* operator new[](std::size_t size, const std::nothrow_t&) noexcept; // replaceable, nodiscard in C++20 70void* operator new[](std::size_t size, std::align_val_t alignment, 71 const std::nothrow_t&) noexcept; // replaceable, C++17, nodiscard in C++20 72void operator delete[](void* ptr) noexcept; // replaceable 73void operator delete[](void* ptr, std::size_t size) noexcept; // replaceable, C++14 74void operator delete[](void* ptr, 75 std::align_val_t alignment) noexcept; // replaceable, C++17 76void operator delete[](void* ptr, std::size_t size, 77 std::align_val_t alignment) noexcept; // replaceable, C++17 78void operator delete[](void* ptr, const std::nothrow_t&) noexcept; // replaceable 79void operator delete[](void* ptr, std::align_val_t alignment, 80 const std::nothrow_t&) noexcept; // replaceable, C++17 81 82void* operator new (std::size_t size, void* ptr) noexcept; // nodiscard in C++20 83void* operator new[](std::size_t size, void* ptr) noexcept; // nodiscard in C++20 84void operator delete (void* ptr, void*) noexcept; 85void operator delete[](void* ptr, void*) noexcept; 86 87*/ 88 89#include <__config> 90#include <__exception/exception.h> 91#include <__type_traits/is_function.h> 92#include <__type_traits/is_same.h> 93#include <__type_traits/remove_cv.h> 94#include <__verbose_abort> 95#include <cstddef> 96#include <version> 97 98#if defined(_LIBCPP_ABI_VCRUNTIME) 99# include <new.h> 100#endif 101 102#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 103# pragma GCC system_header 104#endif 105 106#if !defined(__cpp_sized_deallocation) || __cpp_sized_deallocation < 201309L 107# define _LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION 108#endif 109 110#if !defined(_LIBCPP_BUILDING_LIBRARY) && _LIBCPP_STD_VER < 14 && defined(_LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION) 111# define _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 112#endif 113 114#if defined(_LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION) || defined(_LIBCPP_HAS_NO_LANGUAGE_SIZED_DEALLOCATION) 115# define _LIBCPP_HAS_NO_SIZED_DEALLOCATION 116#endif 117 118namespace std // purposefully not using versioning namespace 119{ 120 121#if !defined(_LIBCPP_ABI_VCRUNTIME) 122struct _LIBCPP_EXPORTED_FROM_ABI nothrow_t { 123 explicit nothrow_t() = default; 124}; 125extern _LIBCPP_EXPORTED_FROM_ABI const nothrow_t nothrow; 126 127class _LIBCPP_EXPORTED_FROM_ABI bad_alloc : public exception { 128public: 129 bad_alloc() _NOEXCEPT; 130 _LIBCPP_HIDE_FROM_ABI bad_alloc(const bad_alloc&) _NOEXCEPT = default; 131 _LIBCPP_HIDE_FROM_ABI bad_alloc& operator=(const bad_alloc&) _NOEXCEPT = default; 132 ~bad_alloc() _NOEXCEPT override; 133 const char* what() const _NOEXCEPT override; 134}; 135 136class _LIBCPP_EXPORTED_FROM_ABI bad_array_new_length : public bad_alloc { 137public: 138 bad_array_new_length() _NOEXCEPT; 139 _LIBCPP_HIDE_FROM_ABI bad_array_new_length(const bad_array_new_length&) _NOEXCEPT = default; 140 _LIBCPP_HIDE_FROM_ABI bad_array_new_length& operator=(const bad_array_new_length&) _NOEXCEPT = default; 141 ~bad_array_new_length() _NOEXCEPT override; 142 const char* what() const _NOEXCEPT override; 143}; 144 145typedef void (*new_handler)(); 146_LIBCPP_EXPORTED_FROM_ABI new_handler set_new_handler(new_handler) _NOEXCEPT; 147_LIBCPP_EXPORTED_FROM_ABI new_handler get_new_handler() _NOEXCEPT; 148 149#elif defined(_HAS_EXCEPTIONS) && _HAS_EXCEPTIONS == 0 // !_LIBCPP_ABI_VCRUNTIME 150 151// When _HAS_EXCEPTIONS == 0, these complete definitions are needed, 152// since they would normally be provided in vcruntime_exception.h 153class bad_alloc : public exception { 154public: 155 bad_alloc() noexcept : exception("bad allocation") {} 156 157private: 158 friend class bad_array_new_length; 159 160 bad_alloc(char const* const __message) noexcept : exception(__message) {} 161}; 162 163class bad_array_new_length : public bad_alloc { 164public: 165 bad_array_new_length() noexcept : bad_alloc("bad array new length") {} 166}; 167#endif // defined(_LIBCPP_ABI_VCRUNTIME) && defined(_HAS_EXCEPTIONS) && _HAS_EXCEPTIONS == 0 168 169_LIBCPP_NORETURN _LIBCPP_EXPORTED_FROM_ABI void __throw_bad_alloc(); // not in C++ spec 170 171_LIBCPP_NORETURN inline _LIBCPP_HIDE_FROM_ABI void __throw_bad_array_new_length() { 172#ifndef _LIBCPP_HAS_NO_EXCEPTIONS 173 throw bad_array_new_length(); 174#else 175 _LIBCPP_VERBOSE_ABORT("bad_array_new_length was thrown in -fno-exceptions mode"); 176#endif 177} 178 179#if !defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) && !defined(_LIBCPP_ABI_VCRUNTIME) 180# ifndef _LIBCPP_CXX03_LANG 181enum class align_val_t : size_t {}; 182# else 183enum align_val_t { __zero = 0, __max = (size_t)-1 }; 184# endif 185#endif 186 187#if _LIBCPP_STD_VER >= 20 188// Enable the declaration even if the compiler doesn't support the language 189// feature. 190struct destroying_delete_t { 191 explicit destroying_delete_t() = default; 192}; 193inline constexpr destroying_delete_t destroying_delete{}; 194#endif // _LIBCPP_STD_VER >= 20 195 196} // namespace std 197 198#if defined(_LIBCPP_CXX03_LANG) 199# define _THROW_BAD_ALLOC throw(std::bad_alloc) 200#else 201# define _THROW_BAD_ALLOC 202#endif 203 204#if !defined(_LIBCPP_ABI_VCRUNTIME) 205 206_LIBCPP_NODISCARD _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz) _THROW_BAD_ALLOC; 207_LIBCPP_NODISCARD _LIBCPP_OVERRIDABLE_FUNC_VIS void* 208operator new(std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; 209_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p) _NOEXCEPT; 210_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, const std::nothrow_t&) _NOEXCEPT; 211# ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 212_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::size_t __sz) _NOEXCEPT; 213# endif 214 215_LIBCPP_NODISCARD _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz) _THROW_BAD_ALLOC; 216_LIBCPP_NODISCARD _LIBCPP_OVERRIDABLE_FUNC_VIS void* 217operator new[](std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; 218_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p) _NOEXCEPT; 219_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, const std::nothrow_t&) _NOEXCEPT; 220# ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 221_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::size_t __sz) _NOEXCEPT; 222# endif 223 224# ifndef _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION 225_LIBCPP_NODISCARD _LIBCPP_OVERRIDABLE_FUNC_VIS void* 226operator new(std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC; 227_LIBCPP_NODISCARD _LIBCPP_OVERRIDABLE_FUNC_VIS void* 228operator new(std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; 229_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t) _NOEXCEPT; 230_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT; 231# ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 232_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT; 233# endif 234 235_LIBCPP_NODISCARD _LIBCPP_OVERRIDABLE_FUNC_VIS void* 236operator new[](std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC; 237_LIBCPP_NODISCARD _LIBCPP_OVERRIDABLE_FUNC_VIS void* 238operator new[](std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _LIBCPP_NOALIAS; 239_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t) _NOEXCEPT; 240_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT; 241# ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION 242_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT; 243# endif 244# endif 245 246_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI void* operator new(std::size_t, void* __p) _NOEXCEPT { 247 return __p; 248} 249_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI void* operator new[](std::size_t, void* __p) _NOEXCEPT { 250 return __p; 251} 252inline _LIBCPP_HIDE_FROM_ABI void operator delete(void*, void*) _NOEXCEPT {} 253inline _LIBCPP_HIDE_FROM_ABI void operator delete[](void*, void*) _NOEXCEPT {} 254 255#endif // !_LIBCPP_ABI_VCRUNTIME 256 257_LIBCPP_BEGIN_NAMESPACE_STD 258 259_LIBCPP_CONSTEXPR inline _LIBCPP_HIDE_FROM_ABI bool __is_overaligned_for_new(size_t __align) _NOEXCEPT { 260#ifdef __STDCPP_DEFAULT_NEW_ALIGNMENT__ 261 return __align > __STDCPP_DEFAULT_NEW_ALIGNMENT__; 262#else 263 return __align > _LIBCPP_ALIGNOF(max_align_t); 264#endif 265} 266 267template <class... _Args> 268_LIBCPP_HIDE_FROM_ABI void* __libcpp_operator_new(_Args... __args) { 269#if __has_builtin(__builtin_operator_new) && __has_builtin(__builtin_operator_delete) 270 return __builtin_operator_new(__args...); 271#else 272 return ::operator new(__args...); 273#endif 274} 275 276template <class... _Args> 277_LIBCPP_HIDE_FROM_ABI void __libcpp_operator_delete(_Args... __args) { 278#if __has_builtin(__builtin_operator_new) && __has_builtin(__builtin_operator_delete) 279 __builtin_operator_delete(__args...); 280#else 281 ::operator delete(__args...); 282#endif 283} 284 285inline _LIBCPP_HIDE_FROM_ABI void* __libcpp_allocate(size_t __size, size_t __align) { 286#ifndef _LIBCPP_HAS_NO_ALIGNED_ALLOCATION 287 if (__is_overaligned_for_new(__align)) { 288 const align_val_t __align_val = static_cast<align_val_t>(__align); 289 return __libcpp_operator_new(__size, __align_val); 290 } 291#endif 292 293 (void)__align; 294 return __libcpp_operator_new(__size); 295} 296 297template <class... _Args> 298_LIBCPP_HIDE_FROM_ABI void __do_deallocate_handle_size(void* __ptr, size_t __size, _Args... __args) { 299#ifdef _LIBCPP_HAS_NO_SIZED_DEALLOCATION 300 (void)__size; 301 return std::__libcpp_operator_delete(__ptr, __args...); 302#else 303 return std::__libcpp_operator_delete(__ptr, __size, __args...); 304#endif 305} 306 307inline _LIBCPP_HIDE_FROM_ABI void __libcpp_deallocate(void* __ptr, size_t __size, size_t __align) { 308#if defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) 309 (void)__align; 310 return __do_deallocate_handle_size(__ptr, __size); 311#else 312 if (__is_overaligned_for_new(__align)) { 313 const align_val_t __align_val = static_cast<align_val_t>(__align); 314 return __do_deallocate_handle_size(__ptr, __size, __align_val); 315 } else { 316 return __do_deallocate_handle_size(__ptr, __size); 317 } 318#endif 319} 320 321inline _LIBCPP_HIDE_FROM_ABI void __libcpp_deallocate_unsized(void* __ptr, size_t __align) { 322#if defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) 323 (void)__align; 324 return __libcpp_operator_delete(__ptr); 325#else 326 if (__is_overaligned_for_new(__align)) { 327 const align_val_t __align_val = static_cast<align_val_t>(__align); 328 return __libcpp_operator_delete(__ptr, __align_val); 329 } else { 330 return __libcpp_operator_delete(__ptr); 331 } 332#endif 333} 334 335template <class _Tp> 336_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Tp* __launder(_Tp* __p) _NOEXCEPT { 337 static_assert(!(is_function<_Tp>::value), "can't launder functions"); 338 static_assert(!(is_same<void, __remove_cv_t<_Tp> >::value), "can't launder cv-void"); 339 return __builtin_launder(__p); 340} 341 342#if _LIBCPP_STD_VER >= 17 343template <class _Tp> 344[[nodiscard]] inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp* launder(_Tp* __p) noexcept { 345 return std::__launder(__p); 346} 347#endif 348 349#if _LIBCPP_STD_VER >= 17 350 351# if defined(__GCC_DESTRUCTIVE_SIZE) && defined(__GCC_CONSTRUCTIVE_SIZE) 352 353inline constexpr size_t hardware_destructive_interference_size = __GCC_DESTRUCTIVE_SIZE; 354inline constexpr size_t hardware_constructive_interference_size = __GCC_CONSTRUCTIVE_SIZE; 355 356# endif // defined(__GCC_DESTRUCTIVE_SIZE) && defined(__GCC_CONSTRUCTIVE_SIZE) 357 358#endif // _LIBCPP_STD_VER >= 17 359 360_LIBCPP_END_NAMESPACE_STD 361 362#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 363# include <cstdlib> 364# include <type_traits> 365#endif 366 367#endif // _LIBCPP_NEW 368